隧道施工通风数值模拟与自动控制技术研究
发布时间：2018-10-22 15:57
【摘要】：在隧道工程中,施工通风是决定隧道能否修建的重要因素。在关虎冲隧道施工通风实践的基础上,结合隧道施工通风存在的普遍问题,本文采用数值模拟分析了双洞隧道施工过程中有毒有害气体扩散效应,并提出了隧道施工通风自动控制技术,探讨了该技术方案的关键技术难题,包括自动控制通风系统的组成结构、风机变频技术、PLC及模糊PID控制技术、隧道环境数据采集、通讯原理等。概括起来取得了以下新的研究成果： 1、研究发现隧道独头掘进时,如果两条隧道的通风功率不一样,一条隧道掌子面爆破作业后产生的有毒有害气体会沿着双洞隧道间的人行横道扩散,进而影响另一条隧道的空气质量。分析了隧道内不同区域受有毒有害气体的污染程度。根据爆破后的双洞等功率通风有毒有害气体扩散效果的研究,提出了更为合理的通风管理措施。 2、实现了隧道施工通风自动控制,编制了相应的控制语言,该程序能够根据各传感器发送传输过来的数据,对其进行分析判断,发出具体的控制指令。其工作流程可以表述为传感器实时测监现场数据指标,通过PLC进行数据采集与转换,上传至控制软件对采集的数据与设定值进行对比分析,根据预设评判标准对风机运行参数进行调节,发出控制指令,通过变频器等控制执行单元对风机进行调控,形成一次控制过程,接着通过传感器二次数据采集反馈上一次调控的实际效果,开始新一轮的自适应控制过程,形成对风机自动控制的闭环控制。 3、结合隧道施工通风自动控制系统现场应用效果,制定了隧道施工通风自动控制系统施工工法,主要内容包括通风控制系统构建、通风参数计算、施工保障措施、技术规范要求、设备选型与软件调试、系统维护等。
[Abstract]:In tunnel engineering, construction ventilation is an important factor to determine whether the tunnel can be built. On the basis of ventilation practice in Guanhuchong tunnel construction, combined with the common problems of ventilation in tunnel construction, this paper uses numerical simulation to analyze the diffusion effect of toxic and harmful gases in the construction process of double-hole tunnel. The paper also puts forward the automatic control technology of ventilation in tunnel construction, and discusses the key technical problems of the technical scheme, including the structure of automatic control ventilation system, the frequency conversion technology of fan, the control technology of PLC and fuzzy PID, and the data collection of tunnel environment. Communication principles, etc. To sum up, the following new research results have been obtained: 1. The study found that if the ventilation power of the two tunnels is different when tunneling with a single head, the ventilation power of the two tunnels is not the same. The poisonous and harmful gas produced by blasting on the face of one tunnel will spread along the crosswalk between the two tunnels, which will affect the air quality of the other tunnel. The degree of contamination by toxic and harmful gases in different areas of tunnel is analyzed. Based on the study of the diffusion effect of the poisonous and harmful gases in the two-hole ventilation after blasting, the more reasonable ventilation management measures are put forward. 2. The automatic control of ventilation in tunnel construction is realized, and the corresponding control language is compiled. According to the data transmitted by the sensors, the program can analyze and judge the data and issue specific control instructions. The work flow can be expressed as the field data index of sensor real-time measurement and monitoring. The data is collected and converted by PLC and uploaded to the control software to compare and analyze the collected data and the set value. According to the preset evaluation standard, the operating parameters of the fan are adjusted, the control instructions are issued, and the fan is regulated by the control execution unit such as the frequency converter, which forms a control process. Then, through the actual effect of the last control of the sensor's secondary data acquisition and feedback, the new adaptive control process is started. The closed loop control of fan automatic control is formed. 3. Combined with the field application effect of tunnel construction ventilation automatic control system, the construction method of tunnel construction ventilation automatic control system is formulated. The main content includes the construction of ventilation control system. Ventilation parameter calculation, construction safeguard measures, technical specification requirements, equipment selection and software debugging, system maintenance and so on.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4;U453.5
本文编号：2287618
[Abstract]:In tunnel engineering, construction ventilation is an important factor to determine whether the tunnel can be built. On the basis of ventilation practice in Guanhuchong tunnel construction, combined with the common problems of ventilation in tunnel construction, this paper uses numerical simulation to analyze the diffusion effect of toxic and harmful gases in the construction process of double-hole tunnel. The paper also puts forward the automatic control technology of ventilation in tunnel construction, and discusses the key technical problems of the technical scheme, including the structure of automatic control ventilation system, the frequency conversion technology of fan, the control technology of PLC and fuzzy PID, and the data collection of tunnel environment. Communication principles, etc. To sum up, the following new research results have been obtained: 1. The study found that if the ventilation power of the two tunnels is different when tunneling with a single head, the ventilation power of the two tunnels is not the same. The poisonous and harmful gas produced by blasting on the face of one tunnel will spread along the crosswalk between the two tunnels, which will affect the air quality of the other tunnel. The degree of contamination by toxic and harmful gases in different areas of tunnel is analyzed. Based on the study of the diffusion effect of the poisonous and harmful gases in the two-hole ventilation after blasting, the more reasonable ventilation management measures are put forward. 2. The automatic control of ventilation in tunnel construction is realized, and the corresponding control language is compiled. According to the data transmitted by the sensors, the program can analyze and judge the data and issue specific control instructions. The work flow can be expressed as the field data index of sensor real-time measurement and monitoring. The data is collected and converted by PLC and uploaded to the control software to compare and analyze the collected data and the set value. According to the preset evaluation standard, the operating parameters of the fan are adjusted, the control instructions are issued, and the fan is regulated by the control execution unit such as the frequency converter, which forms a control process. Then, through the actual effect of the last control of the sensor's secondary data acquisition and feedback, the new adaptive control process is started. The closed loop control of fan automatic control is formed. 3. Combined with the field application effect of tunnel construction ventilation automatic control system, the construction method of tunnel construction ventilation automatic control system is formulated. The main content includes the construction of ventilation control system. Ventilation parameter calculation, construction safeguard measures, technical specification requirements, equipment selection and software debugging, system maintenance and so on.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4;U453.5
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